NEW GYM GOER LOOKING FOR ADVICE PLEASE♥️

Hey guys! I’m looking for some advice - I am 22 year old female, 5’3 and my weight is currently fluctuating between 9st1 and 9st4 (down from 9st12 on January 15th) I’m trying to hit my target of 8stone10 by the end of march but my weight loss is stalling - I’m currently consuming a max of 1000 calories a day and working out in the gym 5/6 x a week where I burn a minimum of 350-400 calories a session (I only do cardio - this is split between incline treadmill walking and stair master) I also walk to and from the gym which is about another 200 calorie burn total - does anyone have any advice on why my weight loss may be stalling and if I should be doing anything different? All opinions welcome! THANKS ALL♥️♥️